forsyth



R. FORSYTH.

GRINDING MACHINE.

APPLICATION FILED 020.23, 1916. RENEWED SEPT. 23.. 1918..

Patented 11116 24, 1919.

2 SHEETS-SHEEI l.

INC NORRIS PETERS CO.. F O WASHING ION, D C

' R. FORSYTH.

GRINDING MACHINE. APPLICATION mso vac-.23, 1916- RENEWED SEPT. 23. {91s.

Patented June 24, 1919.

2 SHEETS-SHEET 2.

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UN T TE T ATE OFFICE- mme se he Q K y To allwhom it may concern:

Be it known that I, RoBnRrFonsY'rH, a citizen of the United States,.residing atNew York, in the county of New [Yorkand State, of New York, have invented new and useful Improvements in Grinding-Machines, of

whichithe following is a specification, reference being had to the accompanying draw-i ings, forming a part thereof. i i 1 V The purpose of this invention is to provide improved apparatus for grinding or pulverizlng ores and the like to reduce them to a uniform degree of fineness, and substantially to a fine flour when so desired. i it consists in the elements and features of construction shown and described as indicated in the claims.

close details, section being made intheihori-i zontal -plane of the axis of one of the rotatingmembers ordisks; a it i Fig. 2is a vertical section ofthe same inr a plane transverse to the axes of the rotating members showing the latter elevation. Fig. 3 is a detail top plan of the central 1 portion showing the hopper opening in relationto the disks. i i r 1 Fig. 4 is an outer side elevation of the pulverizing disks.

Fig. 5 is a detail top plan view of thereceiving mouth or hopperof the machine, as formed by the casing and the conical pulverizing disks therein. a i The machine shown in prises a base frame, A, which is mounted by its marginal portion upon a substantial founone of;

dation or supporting structure, B, within which the pot or casing forming a hopper, (3,

the base frame, A, and inclosing the crushing disks, 1) and D which are mounted for rotating about parallel axes on their respective shafts, E and E which are journaled on the base frame, A. The two disks, D and D are frusto-conical in form of the same taper, and are mounted on their shafts oppositely positioned so that their sloping sides face each other and may come into contact as shown in Fig. 1. Each of the shafts, E and E has a driving pulley, F, said driving pulleys being of the same dlameter, so that being driven by belts from equal pulleys on the same t p j idt t i rjsi z Pat nt-ed June 24,1919: 1 Application filed December 23; 1916, sriarno; 138L557. Renewed Sept mber 23, 1913. Serial No. 255,383:

countershaft, not shown,they cause the two fThe material to be pulverized is delivered t into the hopper, G, whose discharge mouth" at its lower 1 end. is seen as g,aw narrow parallelogramniatic rib: directly overhanging the line'of contact or approximation of the two, disks, D andDt, for determiningthe pressure with whichthe twodisks operate upon i material fed between them for crushing, and to determine it ins'uch a way that the diskswmay separatein case any object; should be delivered into the hopper too hard to be crushed betweenthe disks by the pressure at which it is safe to operate them, such: pressure is produced by means of a spring; fLkCoilecl:aboutithe shaft, E, of one of the disks, and bearing against thefliback .or broader ,baseof that disk when put under tension {by a collar, J, screwed onto the, shaft, it

which is threaded, "for that purpose, a jam nut, K, being provided to prevent loosening. The fineness of theproduct is determined by the relative adjustment of thedisks for separationof their slopingfacesgand this is effected adjusting the; disk, D, by means of 1 the ;collar, L, screwed on the shaft; abutting the narrower base of the disk, D, and re i t ined-by: i I, 1ep1-ese11tgsa the drawings comcushioning washer interposed between the collar L and the narrower base of the disk,

D, to cushion thereturn of the disk against the collar when it is crowded away from it by the passage of an uncrushable body be tween the two disks.

All the journal bearings of the shaft E and E are preferably roller bearings, and most preferably ball bearings as shown in respect to one of them which 1s represented in axial section in Fig. 3. Each journal box, R, is chambered to afford lubricant space. r; and the complete ball bearings comprising the balls and the inner and outer ball races and the retaining collars, is entered through the inner open end of said chamber, 7', to a shoulder 1, the purpose, the end then eing closed around the shaft by an annular collar, R

rovided for ;A thrust bearing provided for each of the shafts at the end toward which the. shaft is thrust by the resistance of the material which is passed between the disks for grinding. These thrust bearings are identicitl fQr the two shaf-ts, and E that of the shaft, E, being shown in Fig. 3', comprisingtwo plates, U and U of tool steel, concaved on their proximate faces, having intervening: between them and seating on said concave faces a hard gun-metal doubleconvex lens shaped member V. The member, U, is designed to be held rigidly in a socketprovide'd-in the outer end of the journal box, and the'member, U may be forced onto the end of the shaft soas to be rigid therewith. In rotation of the shaft the lens member, V, may be said to float between member, V, being peripherally unrestrained with respect to the adjacent concave-faced members, U, it is left free toaccommodate itself with respect to both the opposed concave faces in case of any inaccuracies of alinement of the axis of the shaft with the axes of the cavity of either'or bothof said concave faces. 1 V

The most" 'mportant and essential feature ofthe construction is the characterof thedisks D and D 4 These disks are made of. semi-steeL'or-all steel, of a tough but. 1 fairly soft character, being boredto accommodate the shaft which is properly keyed thereto,-the disk, D being fixed in position upon the shaft E and the disk, D, being mounted for sliding onthe shaft E by means -of a key (Z, the periphery and the conical face of the disk being smooth. Cores are copies of this patent may be obtained for let in on the back of each disk to form ,dovetailpockcts (Z3 which may be filled more or less with soft metal for balancing the disks, The important feature of the operation of these disks is, that, being of soft metal, they permit the embedding of the material to be ground into their faces rotating upon each other, thus forming upon each disk a grinding surface of the consistency and character of the material which is being ground; said material as it is crushed having its finest particles embedded in the surface of the disk sothat said surface becomes a grinding surface entirely by virtue of this embedded material, and not by virtue of the original character of the surface, which as stated is machined perfectly smooth. The result of this construction and method of operation is that the disks do not wear away at all in performing their function of grinding, because the entire grinding surface is furnished to them by the material ground, and therefore constantly renews itself.

I claim A pulverizer or grinder comprising two metal disks each frusto-conical in form journaled for rotation with their conical surfaces facing each other, and means for revolving them in opposite directions about their respective axes, whereby they have the same direction of circumferential movement at thelr proximate surfaces, each disk being formed as to its conically surfaced. portion of comparatively soft and tough metal adapted for embedding the pulverized matcrialwhich is passed between the disks and crushed thereby.

In testimony whereof I have'hereunto set my hand at New York this 23 day of Febru'ary," 1916.

ROBERT FORSYTH.

Witness: I

ANNA V. WALSH.

five cents each, by addressing the Commissioner of Patents, WashingtomD. 0. 

